Engine valve



Jan. 1, 1929. 1,697,718

F. L. CROFT ENGINE VALVE QFiled May 25, 1927 2 Sheets-Sheet 1 W v F L ftr0 INVENTOR ATTO R N EY Jan. 1, 1929.

F. L. CROFT ENGINE VALVE 2 Sheets-Sheet 2 Filed May 25, 1927 E Z. 0 flNVENTOR ATTO R N EY Patented Jan. 1, 1929.

UNITED STATES FRED L. CROFT, OF COAL-INGA, CALIFORNIA.

ENGINE VALVE.

Application filed May 25,

The object of this inventionis to provide a special form of valve, orvalves, for controlling the inlet and exhaust connections of an internalcombustion engine.

A further object is to provide a slide valve for controlling each port,the valve being mounted in the wall of the cylinder, and the valvechamber being directly above the crank case, on each side, and beingclosed, so that oil agitated in the crank case will pass into the valvechamber to a suflicient extent to provide lubrication, and the oil, thusemployed, or any slight excess, will flow back to the crank casing.

A further object is to provide a slide valve of the special constructiondisclosed below, this valve being guided in a particular manner, andbeing operated from a cam shaft within the crank casing, and on eachside thereof.

Vith the foregoing and other objects in view, the invention consists inthe novel construction and arrangement of elements described,illustrated and claimed, it being un- 35 derstood that modifications maybe made within the scope of the claim without departing from the spiritof the invention.

In the drawings forming part of this application,

Figure 1 is a vertical section thru an engine cylinder, and a portion ofthe crank casing. V

Figure 2 is a horizontal section through the cylinder walls, and abovethe piston of Figure 1.

Figure 3 is a fragmentary view in elevation, showing a portion of acylinder and a portion of the crank case, the outer wall or coverportions of the valve chamber being broken away, to show the slide valveand the mounting means therefor.

Figure 4 is a perspective view of the valve per se.

Figure 5 shows another form of mounting,the valve being on the outercurved wall of a cylinder, a portion of which is illustrated. Y

The engine cylinder 10 is provided with a lateral extension, as shown inpart at 11, and is provided with usual water chambers, the intake portbeing designated 12, and the exhaust port being shown at 13. i Amanifold 14 on the intake side serves an obvious purpose and is incommunication with port 12 thru one of the slide valves, and the exhaustmanifold 15 is in communication with port 1927, Serial No. 194,217.

13. The piston within the cylinder 10 is designated 17 and is carried byor has connection with rod 18 passing into crank casmg 19.

Vithin the crank casing 19 are shafts 20 carrying cams 21 adapted tooperate the elements 22 thru which movement is imparted to Valve stemssuch as 23 within each outer chamber 24.

The valve chamber is closed by cover plates such as 26 and 27, thesebeing independently detachable for reasons clearly apparent to thosefamiliar with this class of apparatus. 7

The valves 30 are of the form shown in Figure 4 in perspective, and areeach pro vided with a port 31, and with flanges 32 on opposite sides,these flanges being guided within the portions 33 extending from thecylinders, and it will be observed that the main or central portions ofthe valves are curved'in conformity with the curvature of the cylinderwalls.

T'appets are shown at 22, and jam nuts are designated 23, and the stems23 are vertically movable for the purpose of operating the valves, saidstems passing thru bushings 36, and the elements 22 passing thrubushings 36. Each stem carries a collar 38 engaged by spring 89, thelatter surrounding the stem 23 and engaging at its upper end the element36 projecting form the cylinder wall. The valves are operable in contactwith compression elements such as those shown at 41.

In the form of Figure 5, valve 30 is provided with flanges 32, and thevalve is mounted in guides 40 on the outer wall 10' of a cylinder.

The operation of valves of this type is efficient and reliable, and theyinclude mountingmeans adapted tobe lubricated without attention on thepart of the operator of the car, dependence being placed in part on thesplashing of oil in the crank case, and the passage of a sufficientquantity thereof into the chambers at the sides of the cylinder.Adjustment of the tappet and jam nut on each side provides for theadjustment of the valve. The upper element 27 of the cover is providedwith an inwardly'ext-ending flange at 27, and this flange, as well asthe flat surface of the cover, aids in guiding and retaining the valve30. j

Having described the invention what is claimed is The combination withan engine cylinder having a port' in the Wall thereof, of a slide valvecontrolling the port, said valve including a stem and including edgeflanges extending outwardly therefrom, the cylinder Wall 5 includingmeans for guidingthe edge portions of the valve, a chamber beingprovided in the Wall, detachable means for closing the chamber,projecting between the flanges of the Valve, and aiding in guiding thevalve,

a cam shaft adapted to be mounted in the crank casing, an elementoperated by the shaft and cam; and adjustable means carried by the stemand adapted for engagement by the-element operated from the cam shaft.

In testimony whereof I aflix my signature. FRED L. CROFT.

